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F. ZENKER.

ELECTRICAL SWITCH.

APPLICATION FILED JUNE 20,1917.

1,320,595.; Patented Nov! 4, 1919.

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FREDRICK ZER'KEB, 0F HIGHLAND PARK, MICHIGAN, ASSIGNOR TO DETROIT FUSE &

MANUFACTURING COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICH- IGAN.

ELECTRICAL SWITCH.

specification of Letters Patent.

Patented Nov. a, rare,

Application filed June 20, 1917. Serial No. 175,755.

To all whom it may concern:

Be it known that I, FREDRIGK ZENKERL a subject of the Emperor of Germany, residing at Highland Park, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Electrical Switches, of which the following, taken in connection with the accompanying sheets of drawings, is a full, clear, and concise description thereof.

This invention relates to electrical switches and more particularly to switches of the inclosed type operable from the exterior of the casing.

It has for one of its objects the provision of a switch characterized by simplicity of construction and cheapness of manufacture and at the same time embody all of the ad-.

vantageous features of a more expensive form of inclosed switch.

' Another object of the invention isthe production of a switch inwhich the cross-head connecting the knife blade contacts is mounted in substantial alinement with the pivot points of the blade contacts.

Other objects of the invention have to do with various features of construction and arrangement of parts hereinafter set forth and defined by the appended claim.

The invention will be particularly described and the various features thereof eX- plained in detail by referring to the accompanying drawings, in which Figure l is a perspective of a switch embodying features of my invention showing the switch mounted in a casing with part of the casing cut away.

Fig. 2 is a plan View showing more in detail the method of connecting the knife blades to the cross-head and the suspension of the movable parts; and

Fig. 3 is a section taken on line 33 of Fig. 1, showing the manner of attaching the cross-head to the knife blades.

In the drawing there is shown a switch 1,

mounted within the casing 2, and having I associated therewith protective devices 3. The switch 1 is comprised of pairs of spaced apart stationary contacts 44, each of which is adapted to be united by a connector 01' blade contact 5. The contacts 4- 4 may contacts 55 are united by a cross-head 7 made of insulating material. This mounting may be effected in a manner illustrated in detail by Fig. 8-that is, reducing the width ofeach of the connectors 5 ad acent one of their ends so as to 'form a tongue Which is adapted to extend through suitable apertures provided in the cross-l1ead 7 The blades 5 are then secured in place by placing a washer 8 over the protecting tongue portion, and flattening down the end of the blade, so as to form a rivet connection between the blade and the cross-head.

The cross-head 7 is pivotally mounted or suspended by suitable means attached to the respective ends thereof. This means may comprise an L-shaped operating crank 9 having one of its ends extending on the outside of the casing 2, and the other end provided with a flattened area 10 which may e riveted or otherwise secured to the adj acen't end of the cross-head 7. To the opposite end of the cross-head 7 there is fastened a stud or spindle 11 which is adapted to have one of its ends extend through the side 10f the casing in substantial alinement with the corresponding end of the crank 9. The spindle 1]. may be secured to the cross-head in a manner similar to that used in securing the crank 9 in the same element. To limit the lateral movement of the switch blades 5 when thrown to a disengaging or off position, there is provided stop members 88, one being mounted adjacent each side of the casing and in close proximity thereto, so as to afford a limited lateral or transverse movement of the cross-head, but at the same time restrain this movement so as to hold the blades 5 in position for engagement or cooperation with their associated contacts. This retaining means 8 may comprise cotter pins passed through holes drilled in the the spindle 11 or any other appropriate means may be used for accomplishing the same purpose.

From the above it is obvious that the con nectors or blade contacts 5 may be caused to disengage the stationary contacts 4 by causing the former to describe a considerable arc, the cross-head 7 functioning as a pivot point, by the manipulation of the handle 9. Furthermore, in this form'of construction it is readily seen that the parts are few and si ple which enter into the switch make-. up, and that an inclosed type of switch is produced which is very economical to manufactnre,

inclosed switch.

While I have herein shown and particularly described the preferred embodiment of my invention, to the precise details of construction illustrated, as changes may be readily made without departing from the spirit and scope of my invention. a v,

What is claimed is: In a switch, in combination, a casing having opposed walls, a switch operating memand at the same time possess all of. the features of a more expensive form of I do not want to be limitedher having a portion interned to pivot in one of said walls, an opposite pivot piece connected to said inturned portion by an insulating member, said member having a flattened side, knife blades having their ends provided with tongues which penetrate the connecting member, the body of the blade abutting the flattened side thereof, and sets of contacts at one side of said connector member adapted to be engaged and elec-. trically connected blades.

FREDRIOK ZiJNKER.

together by said knife 25 

